Study Suggests Apple Watch Heart Rate Monitor Can Detect Hypertension and Sleep Apnea

Discussion in 'iOS Blog Discussion' started by MacRumors, Nov 13, 2017.

  1. MacRumors macrumors bot


    Apr 12, 2001

    The Apple Watch may be able to accurately detect hypertension and sleep apnea, according to a new study published today by the University of California San Francisco (UCSF) and Cardiogram, a company that's developed an app that breaks down heart rate data collected by the Apple Watch.

    Using data collected from 6,115 Apple Watch owners and interpreted by Cardiogram's deep neural network "DeepHeart," the study found that the neural network was able to recognize hypertension (aka high blood pressure) with 82 percent accuracy and sleep apnea with 90 percent accuracy.


    Based on previously-established principles suggesting people with low heart rate variability are 1.44x more likely to develop hypertension and that algorithms can accurately determine sleep apnea by beat-to-beat rate variability, Cardiogram and UCSF researchers recruited people for a Health eHeart study and then trained the DeepHeart neural network to detect new variables.

    Cardiogram co-founder Brandon Ballinger told TechCrunch the DeepHeart neural network was trained using data from 70 percent of participants, and then tested on the remaining 30 percent who were not used for training purposes. Of the 6,115 people who participated in the study, sleep apnea was detected in 1,016 participants and hypertension in 2,230.

    The study results are promising enough that Cardiogram believes with additional research, wearables like the Apple Watch could be used as a cost effective way to test for hypertension and sleep apnea.
    Cardiogram says that peer-reviewed clinical research will be necessary to further determine whether wearables are able to screen for major health conditions like sleep apnea and hypertension, but the research results will be translated into future Cardiogram features.

    Cardiogram previously used the same neural network and Apple Watch data to determine that the Apple Watch is able to detect abnormal heart rate rhythms with 97 percent accuracy. This has led Apple team up with Stanford for its own study on whether the Apple Watch can detect abnormal health rhythms and common heart problems.

    In the future, Cardiogram plans to expand its research to additional conditions like pre-diabetes and diabetes.

    Article Link: Study Suggests Apple Watch Heart Rate Monitor Can Detect Hypertension and Sleep Apnea
  2. FelixDerKater Contributor


    Apr 12, 2002
    Nirgendwo in Amerika
    Too bad the battery doesn’t last long enough to wear all night and be charged for the next day...
  3. macTW Suspended

    Oct 17, 2016
    Apple is entering the health industry, revolutionizing self care... but not battery tech.
  4. KazKam macrumors 6502


    Oct 25, 2011
    I used to think that too, but I've recently started wearing my watch to bed to monitor my sleep with the app Sleep Watch.

    Turns out getting the battery to last for me throughout the day and night was just a matter of changing my charging habits. Now I charge the watch after I get up while I'm getting ready. Usually charges enough to make it through the day and the next night... and that's with a Series 0.
  5. Craiger macrumors 6502a


    Jul 11, 2007
    I sleep with mine every night. I charge it for about 1.5 hours each morning before work.
  6. Mad Mac Maniac macrumors 601

    Mad Mac Maniac

    Oct 4, 2007
    A little bit of here and a little bit of there.
    Wow, that is really amazing all the things the Apple Watch can detect even without adding any more sensors. I figured all this stuff would be coming in the future with additional sensors. The product that keeps getting better

    True... however it’s really easy to charge 30 mins at morning and night while getting ready for bed/morning. That’s what I’ve been doing for nearly 2 years. 60 minutes of charging (split between morning and night) has been enough for me most of the time, because the watch charges so quickly. Doing this actually increases the longevity of the watch by keeping it between 40-80% (typically about where mine stays), rather than allowing it to drain low and then sit on the charger all night long. Obviously depending on your schedule you might have to adjust, but I haven’t had any issues.
  7. QuarterSwede, Nov 13, 2017
    Last edited: Nov 13, 2017

    QuarterSwede macrumors G3


    Oct 1, 2005
    Colorado Springs, CO
    Speak for yourself. The Series 3 42mm lasts about 2.5 days for me and fully charges in 45 min. It gets a full days charge from about 15-20 min.

    I charged it last night while taking a shower. Wore it to bed for use as my alarm and wore it all day without charging it again at work using it (email, messages, Things, the time) and it’s at 67%. If I were to throw it on the charger it would be fullly charged in 10-15 min. That’s about the length of my shower and getting dressed.

    If I sleep with it on I lose about 4% overnight (turning theatre mode on helps).

    The battery life issue has definitely been solved.
  8. thisisnotmyname macrumors 68000


    Oct 22, 2014
    known but velocity indeterminate
    Series 3 has phenomenal battery life. I can go for multiple days before I have to charge.
  9. solipsism, Nov 13, 2017
    Last edited: Nov 13, 2017

    solipsism macrumors 6502a


    Jan 13, 2008
    If you enable Theater Mode you get even more time since the display won't come on every time you move around in bed. If you also put it in AirPlane Mode since it's unlikely that you'll need to get notifications whilst sleeping you can further reduce the power usage.

    I think it only registers like 1–3% over 6 hours with those two enabled. I also only charge while showering and getting ready, which is more than enough time to keep it charged for more than a day (although I do tend to shower twice a day).

    I've even been able to get several days out of my Series 0 on a very long camping trip over a mountain where there was no cell signal by doing those steps, but that had no altimeter or GPS, so I'm not sure how that would work with my Series 3.
  10. ghostface147 macrumors 68020


    May 28, 2008
    I suppose it can based upon pulse rate. I have sleep apnea, about 15 events an hour, and testing showed that I could spike to about a 120 pulse when an event happened. I use a bpap machine at night. Down to about 4-7 events now.
  11. spazzcat macrumors 68020


    Jun 29, 2007
    This true with S0, but the others this is not true. I charge mine for about an hour before bed and sleep with it every night.
  12. Ant2369 macrumors member


    Jul 20, 2011
    I have a series 3 cellular and I have zero battery issues mines been off the charger since 6am I used the Nike run app for a 25 min run and Gymaholic for 68 min workout and I’m at 74%
  13. npmacuser5 macrumors 65816


    Apr 10, 2015
    Through management. I use my Apple Watch1 day and night. How is this possible. One the Apple Watch charges rather quickly. I charge it in the evening when the battery is low. Understand the battery drain caused by activity and things like notifications. After Apple Watch charges in the evening, set do not disturb bedtime to wakeup. My experience sleeping with the Apple Watch, very little battery drain while sleeping. Infact generally less then 10% useage for 8 hours of sleep. Up in morning and off. If the day has an above average notifications, activity, and expecially using workouts, another 1 hours charge will be necessary. Can also select Theater mode at night, further reduces the battery drain. Any battery life increase will always be welcome. End of the day, my Apple Watch 1 will record a minimum of 20 hours with minimum effort on my part. More then enough to get plenty of data on my activity and sleep. Highly recommend the Apple Watch.
  14. dbwie macrumors 6502

    Jun 11, 2007
    Albuquerque, NM, USA

    My Apple Watch series 2 only needs to be charged for about 30 minutes a day, when I'm in the shower, and then I wear it day and night. This includes workouts at the gym. The key is to turn off a bunch of notifications, and be picky about what apps you put on the watch.
  15. Mad Mac Maniac macrumors 601

    Mad Mac Maniac

    Oct 4, 2007
    A little bit of here and a little bit of there.
    Wowzers. That’s way better than I’m getting. I always use Theater Mode when I sleep and, while I don’t monitor it that closely, it seems like my battery usually drains like 10-15% while sleeping. I’ll monitor it more closely tonight. This is on a Series1. And when I took it backpacking (up in maroon bells) I kept it on airplane mode and was only able to get maybe 48 hours. But I brought a charger with me.
  16. scotttnz macrumors 6502a

    Dec 16, 2012
    Auckland, New Zealand
    I've been using my S0 for sleep monitoring since I got my S3. Yesterday my S3 battery was still at 80% when I went to bed at 10:30, so I'm wondering if I really need to use the S0 for this anymore.
  17. wesley96 macrumors 6502


    Sep 21, 2009
    It appears that Apple Watch generally has enough battery to last at least one full day on a single charge in a typical scenario, regardless of generation. All-day watch wearers likely have made it a daily routine to charge the battery for about 30 to 60 minutes at a certain point of the day where wearing it is the least necessary. In my case it's that period about 1 to 2 hours before going to sleep where I chill out in front of a computer or TV and don't really move around much at all.

    I don't do any of those battery-saving tricks (thanks for the heads up, though!) but typically the battery drain during sleep is in the order of 8-12% for my year-old Series 2. It still holds about 40-50% charge left at the end of the day, at my next charging cycle.
  18. sjinsjca macrumors 68020


    Oct 30, 2008
    Horsepucky. My S0 is 2 1/2 years old, and EVERY night it is on my wrist. I’m deaf, so it’s my alarm clock. In the morning I get up, put it on the charger (typically 40-60% charged) have my morning tea, and by the time I’ve had my shower it’s ready for the next 24 hours.

    But, haters gonna hate.
  19. jermwhl macrumors regular


    Sep 29, 2014
    San Diego, CA
    Thanks everyone for the review of battery expectations. I've been considering getting a series 3 (don't own an Apple Watch atm), but had reservations about the battery life. Not many articles detailing charging/daily real world use, so this thread is very helpful in that regard. I'm not a huge consumer of data and doubt I would use the watch for making phone calls, so I think I would probably fall into a lesser battery drain category. I really like the sleep monitoring features and that was my primary concern of WHEN to charge, but it seems like 1-2 hours a day is enough time to charge, which I can easily part with it for that time.
    --- Post Merged, Nov 13, 2017 ---
    I"m just curious. Based on the replies you've gotten contradicting your statement, how often do you have to charge your Apple Watch? Do you consider yourself a "heavy data consumer"?
  20. Shaun, UK Suspended

    Shaun, UK

    Mar 23, 2006
    It’s very easy to detect sleep apnoea using a simple oxygen monitor on your finger overnight.
  21. solipsism macrumors 6502a


    Jan 13, 2008
    If you're using it to make/receive phone calls you'll likely see yourself use more battery life and if you use it to make/receive phone calls without it going through Bluetooth or WiFi via your iPhone then it'll be even more pronounced.

    While the iPhone X can do 21 hours of phone calls, which is well above the normal things we typically do with an iPhone these days, it's very much reversed with Watch. I haven't tested these times—and likely never will as I am not one to stay on the phone for long—but they say up to 1 hour on LTE and 3 hours via BT/WiFi (connected to the iPhones; but they also say it has an 18 hour battery life under typical conditions, which I'd argue is atypically low.

    Screen Shot 2017-11-13 at 6.07.11 PM.jpg
  22. jrlcopy macrumors 6502


    Jun 20, 2007
    Oh man, this is so false. YES if you turn on every possible notification, but if you only use it for important ones, I'm getting 3-4 days out of this thing per charge, and I wear it all day and night. I last charged it Fri night, and I'm at 22%.

    Series 3 LTE, but with the LTE turned off.
  23. djlythium macrumors 6502a


    Jun 11, 2014
    Pretty remarkable findings. I like to see tech utilized like this!
  24. Shirasaki macrumors 604


    May 16, 2015
    Makes me wanting to buy the Apple Watch now, even though I don’t have that much money.
  25. SashJ macrumors regular

    Oct 10, 2017
    You must be wearing it wrong cause mine lasts 2 - 3 days.

Share This Page